Elevate your weekend breakfast with a spinach and sausage croissant strata is an easy breakfast casserole recipe that you can bake in the morning!

There are lots of reasons to make a strata, or breakfast casserole, for the weekend. Whether you are hosting a big family breakfast or brunch, this recipe for spinach and sausage croissant strata is absolutely divine, filled with meat, cheese, eggs, carbs, and vegetables to keep you full all morning long. 

One of the things I love to do is to prep a breakfast casserole the night before, and then allowing it to sit overnight means it can soak up all the egg and milk to create an utterly delicious bread pudding style strata that can be baked in the morning and served warm out of the oven. 

What is a strata? Or breakfast casserole?

A strata can be called other things as well! You might have heard about bread pudding, or breakfast casserole, too! This typically consists of a savory bake, with bread cut or torn into large pieces, an egg and cream (or milk) mixture, with several toppings, and cheese all poured together in a baking dish and baked until cooked through. 

The names for this dish can be used interchangeably, breakfast casserole and strata follow the same form and function, they have a bread or hashbrown starch base, with an egg mixture poured over the top. Hashbrown breakfast casseroles are very popular as well.

What is the difference between a bread pudding and a strata recipe?

Typically the association with bread pudding is for sweet bakes. One of my favorite is this banana rum caramel crunch bread pudding. The rum sauce on this bread pudding recipe that gets poured over the top is to die for! 

Do you have to let a strata sit overnight?

No, it isn’t a requirement that it sits overnight. Does it help? Yup! Allowing the egg mixture and croissant to sit overnight will allow the bread to soak up all the moisture and create a custard like texture to the casserole. If your time is limited, or you don’t want to let it sit overnight, just press the bread and toppings down into the egg mixture when it is in the baking dish so that it is completely covered and starts to soak into all layers of the strata. 

Ingredients for Sausage and Spinach Croissant Breakfast Casserole

The ingredients for this recipe are easy to find in all grocery stores, so this is an every day elevated style recipe that just makes the basic ingredients shine! 

  • 6-7 Butter Croissants
  • 12 Large Eggs
  • 1 cup Half and Half
  • 1 cup Milk
  • 2 Onions
  • Breakfast Sausage
  • 2 cups Sliced Mushrooms
  • 1 cup Wilted and drained Spinach
  • 3 cups Shredded Cheese
  • Butter
  • Olive Oil
  • Kosher Salt and Pepper, as needed.

How to make a breakfast strata or breakfast casserole

The part that takes the longest is the preparation of the ingredients and resting it overnight (if you want to do that). Thankfully, the overnight rest is hands off and done in the fridge, leaving you just the painful waiting to bake and devour this recipe that is hard! 

  1. Prepare all ingredients –
    1.  cut bread or croissants into large cubes, crack and whisk eggs and milk with half and half. 
    2. If caramelizing onions, do this in a large skillet or cast iron skillet over medium heat with lots of butter and some olive oil. Bacon is a good alternative in place of sausage if you feel like it! 
    3. Wilt spinach, or other greens if you are using these. To add more greens, Swiss chard is also a delightful swap.
  2. Spray 9×13 inch baking dish, or my favorite lasagna pan, with non stick cooking spray. Spread half of the bread into the bottom of the prepared baking dish. Sprinkle with half of the toppings, sausage, mushrooms, spinach, and cheese. Repeat with a second layer of croissant pieces and toppings.
  3. Pour the egg and milk mixture evenly over the top of the casserole and sprinkle with additional cheese. 
  4. To allow it to sit overnight, cover the pan with foil and place in the refrigerator. 
  5. Preheat the oven to 350 degrees. Pierce a hole into the top of the foil and bake the breakfast strata for 20 minutes covered. 
  6. After 20 minutes, remove the foil and bake an additional 20-25 minutes, checking with an instant read thermometer to make sure the middle has reached temperature. Allow it to sit on a wire cooling rack for 10-15 minutes before serving.

Variations for Breakfast Strata or Breakfast Casserole

There are so many different ways you can customize this breakfast casserole recipe. I think of it like a quiche, where you just add in whatever you have in your fridge that needs to get used!
Butternut Squash and Sausage Breakfast Strata is one of my other favorites for leftover roasted squash! 

Other ingredients to add in!

  • Diced Ham
  • Tomatoes
  • Cheddar Cheese
  • Mozzarella cheese
  • Monterey Jack or Pepper Jack cheese
  • Broccoli
  • Dry Mustard
  • Curry Powder
  • Squash
  • Bacon
  • Mixed Roasted Veggies
  • Pesto
  • Roasted Red Peppers
  • Shredded chicken

More Inspired Homemade Recipes To Try

Smoked Salmon Green Bean Casserole

Red White and Blueberry Overnight Oats

Authentic All Butter Croissants

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Spinach and Sausage Croissant Breakfast Casserole

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  • Author: Megan Keno
  • Prep Time: 45 Minutes
  • Cook Time: 40-45 Minutes
  • Total Time: 0 hours
  • Yield: 9 Servings
  • Category: Breakfast
  • Method: Skillet
  • Cuisine: American

Description

Elevate your weekend breakfast with a spinach and sausage croissant strata is an easy breakfast casserole recipe that you can bake in the morning!


Ingredients

    • 6-7 Butter Croissants

    • 12 Large Eggs

    • 1 cup Half and Half

    • 1 cup Milk

    • 2 Onions, halved and thinly sliced

    • 1 pound Breakfast Sausage – links cut into bite size pieces or bulk sausage, cooked

    • 2 cups Sliced Mushrooms

    • 1 cup Wilted and drained Spinach

    • 3 cups Shredded Cheese

    • 2-3 Tbsp Butter

    • 1-2 Tbsp Olive Oil

    • Kosher Salt and Pepper, as needed.


Instructions

    1. Preheat oven to 350 degrees.
    2. Caramelize onions in a large skillet with butter and olive oil, until golden brown. Set aside to cool slightly. 
    3. While onions cook, cut croissants into large cubes and set aside.
    4. Crack and whisk eggs with milk and half and half. 
    5. In the same skillet that you used for the onions, you can cook the sausage. Remove from skillet and set aside. Repeat with the spinach. Once cooled enough to handle.
    6. You can also use bacon in place of sausage if you feel like it! 

    1. Spray 9×13 inch baking dish with non stick spray, or my favorite lasagna pan, with non stick cooking spray. Spread half of the bread into the bottom of the prepared baking dish. Sprinkle with half of the toppings, sausage, mushrooms, spinach, and cheese. Repeat with a second layer of croissant pieces and toppings.

    1. Pour the egg and milk mixture evenly over the top of the casserole and sprinkle with additional cheese. 

    1. To allow it to sit overnight, cover the pan with foil and place in the refrigerator. If you are not able to let it sit in the fridge overnight, that is fine. Press down gently on the strata to ensure that all the bread has soaked in as much of the egg mixture as possible.

    1. Cover the strata/breakfast casserole with foil. Pierce a hole into the top of the foil and bake the breakfast strata for 20 minutes, covered. 

    1. After 20 minutes, remove the foil and bake an additional 20-25 minutes, checking with an instant read thermometer to make sure the middle has reached temperature. Allow it to sit on a wire cooling rack for 10-15 minutes before serving.